TY - JOUR
T1 - Raman scattering study of the geometrically frustrated pyrochlore Y2Ru2O7
AU - Bae, J. S.
AU - Yang, In Sang
AU - Lee, J. S.
AU - Noh, T. W.
AU - Takeda, T.
AU - Kanno, R.
N1 - Funding Information:
ISY acknowledges the financial support by the 2003 Advanced Basic Research Laboratory (ABRL) program R14-2003-027-01001-0. This work was supported partly by the Ministry of Science and Technology through the Creative Research Initiative program.
PY - 2006/11/24
Y1 - 2006/11/24
N2 - Geometrically frustrated pyrochlore Y2Ru2O7, which shows a spin-glass-like transition at TG ∼ 80 K, were investigated by temperature-dependent Raman scattering. Three discernable phonons appear around 315, 410, and 510 cm-1 without any abrupt change in the number of Raman active modes within the temperature range of 10-300 K. Fitting each phonon with Lorentz oscillators, we analyzed the effects of temperature on the phonon frequencies and the linewidths. The temperature-dependence of the mode near 510 cm-1 shows abnormal behavior below TG, while the other two phonons follow the usual thermal effect of lattice vibration. This behavior can be understood in terms of spin-phonon coupling. Considering the atomic modulations of each phonon mode, it is conjectured that the 510 cm-1 phonon mode is isotropically coupled to the spin degree of freedom, while the other modes are not.
AB - Geometrically frustrated pyrochlore Y2Ru2O7, which shows a spin-glass-like transition at TG ∼ 80 K, were investigated by temperature-dependent Raman scattering. Three discernable phonons appear around 315, 410, and 510 cm-1 without any abrupt change in the number of Raman active modes within the temperature range of 10-300 K. Fitting each phonon with Lorentz oscillators, we analyzed the effects of temperature on the phonon frequencies and the linewidths. The temperature-dependence of the mode near 510 cm-1 shows abnormal behavior below TG, while the other two phonons follow the usual thermal effect of lattice vibration. This behavior can be understood in terms of spin-phonon coupling. Considering the atomic modulations of each phonon mode, it is conjectured that the 510 cm-1 phonon mode is isotropically coupled to the spin degree of freedom, while the other modes are not.
KW - Geometrically frustrated
KW - Phrochlore YRuO
KW - Raman scattering
UR - http://www.scopus.com/inward/record.url?scp=33750937078&partnerID=8YFLogxK
U2 - 10.1016/j.vibspec.2006.05.004
DO - 10.1016/j.vibspec.2006.05.004
M3 - Article
AN - SCOPUS:33750937078
SN - 0924-2031
VL - 42
SP - 284
EP - 287
JO - Vibrational Spectroscopy
JF - Vibrational Spectroscopy
IS - 2
ER -